Siemens SITRANS LG270 Operating Instructions Manual page 62

10 mm (0.394
")
6 mm (0.236
")
0
-6 mm (-0.236
")
1
-10 mm (-0.394
")
0,1 m (3.937
Fig. 34: Deviation SITRANS LG270 in coax version in oil (measurement length up to 6 m/19.69 ft)
1 Dead band (no measurement possible in this area)
L Probe length
Max. deviation and max. deviating upper
blocking distance - version with refer-
ence distance
Length - Reference dis-
tance (7)
260 mm (10.24 in)
500 mm (19.69 in)
750 mm (29.53 in)
Repeatability
Variables influencing measurement accuracy
Temperature drift - Digital output
Additional deviation through electromag-
netic interference acc. to EN 61326
Influence of the superimposed gas and pressure on measurement accuracy
The propagation speed of the radar impulses in gas or vapour above the medium is reduced by
high pressure. This effect depends on the superimposed gas or vapours.
The following table shows the resulting deviation for some typical gases and vapours. The specified
values refer to the distance. Positive values mean that the measured distance is too large, negative
values that the measured distance is too small.
62
) 0,25 m (9.842 )
" "
Length - Blocking dis-
tance (4)
450 mm (17.72 in)
690 mm (27.17 in)
940 mm (37.01 in)
≤ ±1 mm
±3 mm/10 K relating to the max. measuring range or
max. 10 mm (0.394 in)
< ±10 mm (< ±0.394 in)
SITRANS LG270 - Operating Instructions
L
0,1 m
(3.937
Probe length min. (2)
> 1000 mm (39.37 in)
> 1250 mm (49.21 in)
> 1500 mm (59.06 in)
1
") 0,05 m
(1.968
")
Deviation max.
± 10 %
± 5 %
± 3 %
PBD-51041071